1. Derivatives of Sine, Cosine and Tangent - Interactive Mathematics
https://www.intmath.com/differentiation-transcendental/1-derivative-sine-cosine-tangent.php
WEBThe derivative of sin x is cos x, The derivative of cos x is −sin x (note the negative sign!) and The derivative of tan x is sec 2 x. Now, if u = f(x) is a function of x, then by using the chain rule, we have: `(d(sin u))/(dx)=cos u(du)/(dx)` `(d(cos u))/dx=-sin u(du)/(dx)` `(d(tan u))/(dx)=sec^2u(du)/(dx)` Example 1. Differentiate `y = sin(x ...
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